(enhancement)charts: add standard kubernetes labels to experiments (#346)

Signed-off-by: ksatchit <karthik.s@mayadata.io>

charts/cassandra/cassandra-pod-delete/experiment.yaml

@@ -108,3 +108,4 @@ spec:
 
     labels:
       name: cassandra-pod-delete
+      app.kubernetes.io/part-of: litmus

charts/cassandra/cassandra-pod-delete/rbac.yaml

@@ -6,6 +6,7 @@ metadata:
   namespace: default
   labels:
     name: cassandra-pod-delete-sa
+    app.kubernetes.io/part-of: litmus
 ---
 apiVersion: rbac.authorization.k8s.io/v1
 kind: Role
@@ -14,6 +15,7 @@ metadata:
   namespace: default
   labels:
     name: cassandra-pod-delete-sa
+    app.kubernetes.io/part-of: litmus
 rules:
 - apiGroups: ["","litmuschaos.io","batch","apps"]
   resources: ["pods","deployments","statefulsets","services","pods/log","pods/exec","events","jobs","chaosengines","chaosexperiments","chaosresults"]
@@ -26,6 +28,7 @@ metadata:
   namespace: default
   labels:
     name: cassandra-pod-delete-sa
+    app.kubernetes.io/part-of: litmus
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: Role